EXT4-fs (loop5): unable to read superblock EXT4-fs (loop3): unable to read superblock kauditd_printk_skb: 97 callbacks suppressed audit: type=1400 audit(396.818:7802): avc: denied { map } for pid=26495 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=0 INFO: task syz-executor4:26491 blocked for more than 140 seconds. Not tainted 4.14.72+ #11 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D28960 26491 1844 0x00000004 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:565 [inline] rwsem_down_write_failed+0x390/0x730 kernel/locking/rwsem-xadd.c:594 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 grab_super+0x59/0x170 fs/super.c:373 sget_userns+0x2ae/0xc30 fs/super.c:504 sget+0xcd/0x110 fs/super.c:572 mount_bdev+0xde/0x370 fs/super.c:1122 mount_fs+0x28f/0x31a fs/super.c:1255 vfs_kern_mount.part.9+0xce/0x4a0 fs/namespace.c:1057 vfs_kern_mount fs/namespace.c:1039 [inline] do_new_mount fs/namespace.c:2562 [inline] do_mount+0x404/0x26e0 fs/namespace.c:2892 SYSC_mount fs/namespace.c:3108 [inline] SyS_mount+0xe5/0x100 fs/namespace.c:3085 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457579 RSP: 002b:00007f18d643ec78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457579 RDX: 0000000020000080 RSI: 0000000020000540 RDI: 0000000020000500 RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f18d643f6d4 R13: 00000000004c28af R14: 00000000004d3c78 R15: 00000000ffffffff Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541 2 locks held by getty/1755: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1ff/0x15e0 drivers/tty/n_tty.c:2142 2 locks held by syz-executor4/26491: #0: (&bdev->bd_fsfreeze_mutex){+.+.}, at: [] mount_bdev+0x81/0x370 fs/super.c:1116 #1: (&type->s_umount_key#48){+.+.}, at: [] grab_super+0x59/0x170 fs/super.c:373 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.72+ #11 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x574/0xa70 kernel/hung_task.c:252 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 26446 Comm: syz-executor4 Not tainted 4.14.72+ #11 task: ffff8801ca7aaf00 task.stack: ffff8801a4a08000 RIP: 0010:match_held_lock kernel/locking/lockdep.c:3555 [inline] RIP: 0010:find_held_lock+0x43/0x2e0 kernel/locking/lockdep.c:3599 RSP: 0018:ffff8801a4a0f730 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffff8801ca7ab758 RCX: ffff8801a4a0f7a8 RDX: 1ffff100394f56ed RSI: ffffffff8cacd720 RDI: ffff8801ca7ab768 RBP: ffffffff8dfd03a0 R08: 0000000000000001 R09: 0000000000000000 R10: ffff8801ca7ab758 R11: 0000000000000001 R12: 0000000000000001 R13: 0000000000000002 R14: ffff8801a4a0f7a8 R15: ffffffff8cacd720 FS: 00007f18d6460700(0000) GS:ffff8801dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f66fa1ce140 CR3: 00000001c860c002 CR4: 00000000001606b0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: __lock_release kernel/locking/lockdep.c:3760 [inline] lock_release+0x1ec/0x720 kernel/locking/lockdep.c:4010 rcu_lock_release include/linux/rcupdate.h:249 [inline] rcu_read_unlock include/linux/rcupdate.h:687 [inline] find_get_entry+0x13f/0x550 mm/filemap.c:1367 pagecache_get_page+0x45/0x770 mm/filemap.c:1440 find_get_page_flags include/linux/pagemap.h:282 [inline] __find_get_block_slow fs/buffer.c:213 [inline] __find_get_block+0x348/0x8e0 fs/buffer.c:1356 __getblk_slow fs/buffer.c:1099 [inline] __getblk_gfp+0x186/0x720 fs/buffer.c:1382 __bread_gfp+0x28/0x1e0 fs/buffer.c:1416 sb_bread_unmovable include/linux/buffer_head.h:313 [inline] ext4_fill_super+0x574/0xb5e0 fs/ext4/super.c:3488 mount_bdev+0x2ab/0x370 fs/super.c:1149 mount_fs+0x28f/0x31a fs/super.c:1255 vfs_kern_mount.part.9+0xce/0x4a0 fs/namespace.c:1057 vfs_kern_mount fs/namespace.c:1039 [inline] do_new_mount fs/namespace.c:2562 [inline] do_mount+0x404/0x26e0 fs/namespace.c:2892 SYSC_mount fs/namespace.c:3108 [inline] SyS_mount+0xe5/0x100 fs/namespace.c:3085 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457579 RSP: 002b:00007f18d645fc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457579 RDX: 0000000020000080 RSI: 0000000020000540 RDI: 0000000020000500 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f18d64606d4 R13: 00000000004c28af R14: 00000000004d3c78 R15: 00000000ffffffff Code: 55 48 8d 04 80 53 48 8d 9c c7 30 08 00 00 48 83 ec 08 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 10 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 7a 02 00 00 4c 3b 7b 10 0f 84 b4 01 00 00 48 8d 7b 22 48